GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the generator connector terminal R.
  2. Start the engine.
  3. Using a J 39200 DMM, measure the DC voltage at the generator terminal R to a good ground.

Does the generator voltage measure at or near the specified value?

7.5 V

Go to Step 2

Go to Charging System Check in Engine Electrical

2

  1. Disconnect the instrument cluster connector 33 CKT 53 (YEL) and C200.
  2. Connect a test lamp at the IPC harness connector terminal 33 CKT 53 (YEL) and B+.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 6

3

With the test lamp connected at the same location from the previous step, disconnect the MFAM.

Does the test lamp still illuminate?

 

Go to Step 4

Go to Step 9

4

With the test lamp connected at the same location from the previous step, disconnect the hourmeter.

Does the test light still illuminate?

 

Go to Step 5

Go to Step 10

5

Test CKT 53 (YEL) for a short to ground between the instrument cluster terminal 33 and C200. Refer to Testing for Short to Ground in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 7

6

Test for continuity between the instrument cluster terminal 33 CKT 53 (YEL) and C200. Refer to Testing for Continuity in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 7

7

Test for continuity or for a short to ground between the generator terminal R CKT 1477 (PPL) and C200. Refer to Testing for Continuity and to Testing for Short to Ground in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 8

8

Replace the IP cluster. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

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Go to Step 11

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9

Replace MFAM. Refer to Multifunction Alarm Module Replacement

Did you complete the replacement?

--

Go to Step 11

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10

Replace Hourmeter. Refer to Engine Hour Meter Replacement

Did you complete the replacement?

--

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

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